- RRF allows you to map the print cooling fan to any fan channel on a per-tool basis. So your main print cooling fan can be connected to the DueX5, and a M106 command without a P parameter will then control it whenever the hot end tool is selected. Or you can control it at any time using M106 with a P parameter that specifies the channel directly.

- Any fan can be configured as a thermostatic fan.

- Alternatively, you can feed the 12V output from the regulator on the DueX5 to the centre pin of the fan voltage selector block on the Duet, then all the fans connected to the Duet will run from 12V.

2. The first DueX5 boards of the latest production batch were tested successfully by our assembly subcontractor yesterday, so they should be on sale very soon.